The remains of a World War I chemical weapons testing and disposal site — known as the American University Experiment Station — were discovered in 1993 in the Spring Valley section of Northwest D.C.

WWI munitions cleanup in Northwest DC nears completion

By Neal Augensteinvia the WTOP radio station (DC) web site

The peaceful serenity of the neighborhood surrounding the stately home at 4825 Glenbrook Road, in the Spring Valley section of Northwest D.C., was matched by the potential danger and uncertainty of chemical agents buried beneath it.

Almost eight years since heavy machinery knocked down the first bricks of the home that had been built atop a World War I chemical weapons testing and disposal site — known as the American University Experiment Station — the painstaking cleanup of what’s been called the “mother of all toxic dumps” is entering its final stages.

U.S. Army Corps of Engineers spokesman Christopher Gardner told WTOP that only two small areas remain to be excavated on the property, after tons of contaminated soil and broken glassware with traces of potentially dangerous chemicals have been removed.

The Spring Valley project began in 1993, when a contractor unearthed buried military ordnance on nearby 52nd Court Northwest. Digging and research indicated the likely presence of mustard gas and lewisite — an arsenic-containing blister agent — under the former home.

In March 2012, after testing of the property between 2007 and 2010, the decision was made to remove the home.